Currently the spec defines that <interceptors>, <decorators> and <alternatives> affect only the Bean Archives where they are configured in (via beans.xml).
Thus if you e.g. enable an Alternative in a WEB-INF/beans.xml, it does NOT count for the jars in it's WEB-INF/lib folder!
This is pretty unhandy because you would need to repackage all your jars in your WEB-INF/lib folder and add/expand the <alternatives> sections in their beans.xml.
Needless to say that this is not only hard to do in a company build but is also impossibly to handle at deploy time in an OSGi environment!